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1 SUMMARY Comparison of the FAA Advisory Circular 150/5325-4B guidance and the SARLAT results shows the value of SARLAT development. SARLAT outputs required runway lengths based on published aircraft manufacturer data and is therefore considered to be credible. Compared to aircraft manufacturers published required runway lengths (SARLAT), the Advisory Circular 150/5325-4B under-estimates the required runway length at lower altitudes (less than 4000 feet) and over- estimates required runway lengths at higher altitudes. The tool can determine the runway length required for new runways at user specified aircraft payloads or can determine the payload that can be carried by aircraft using an existing runway. SARLAT also calculates the additional length of a runway required for air taxi operations (landings). SARLAT performs these analyses an individual aircraft or a group of aircraft. Detailed takeoff and landing performance data is included in the tool for 42 aircraft: specifically, 19 single-engine piston-powered aircraft, nine twin-engine piston-powered aircraft, nine turboprop-powered aircraft, and five turbofan-powered aircraft with maximum takeoff weights less than 20,200 pounds (9,162.6 kilograms). These 42 aircraft make up 51% of the aircraft in the 2021 FAA aircraft registry. We have also provided a list of aircraft not included in SARLAT with similarities to SARLAT aircraft models. Sixty-five percent of the aircraft in the FAA 2021 registry are covered by the extended list of SARLAT and the substitution aircraft. Runway surfaces covered in SARLAT include paved (dry and wet), and where published data is available, grass and gravel. Runways slopes from zero to two degrees are covered (Negative slope runways are not included as they are less demanding than positive.) The tool covers runway pressure altitudes from sea level to 9000 feet, temperature ranges from 40 to 104 degrees Fahrenheit and winds from five tailwind to 10 head winds. Data used for the SARLAT analysis is from manufacturer published pilot operating handbooks aircraft flight manuals and flight planning guides. In the cases of grass and gravel surfaces, where no manufacturer data was published, no data is included in SARLAT. In instances where published data is not available, we used data published for other aircraft, specifically for runway slope. Data used is in these instances is conservative. We coordinated SARLAT development with MITRE Corporation, which is developing a tool to determine the runway length requirements for aircraft weighing more than 12,500 pounds to ensure the efforts were complementary. SARLAT includes a few aircraft weighing between 12,500 and 20,200 pounds as todayâs aircraft in this weight range use small airports, e.g., King Air 350s. User documentation and a project final report are included with this deliverable.
